Hi,what makes the phone screen goes blank is because there is a flex inside that connected to the screen of the phone that makes the phone display is faulty and it needs to be replaced so that the screen can be as one again.

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There is a little rectangle shape thing next to the lg logo on the top of the fone screen. If this is blocked by screen protector it will cause the phone to blank of during calls. Its a power saver that blanks the phone when its near your face. Try it. Take off the screen protector & make a call. Then place your finger over the little thing & the screen goes blank. Just cut a lil space in the screen protector & that will fix the problem